Designed and manufactured in the United States by Rocketdyne (later Pratt & Whitney Rocketdyne and Aerojet Rocketdyne), the RS-25 burns cryogenic (very low temperature) liquid hydrogen and liquid …

The RS-25 powered the space shuttle for over three decades and completed 135 missions. It is one of the most tested large rocket engines in history, with more than 3,000 starts and more than 1 million …

Four RS-25 engines located at the bottom of the core stage power the rocket on its eight and a half minute climb to space with more than 2 million pounds of thrust. The RS-25 evolved from L3Harris’ …

Built in the United States by Rocketdyne, the RS-25 burns cryogenic liquid hydrogen & liquid oxygen propellants, with each engine producing 1,859 kN (418,000 lbf) of thrust at liftoff.

Jun 27, 2025 · RS-25 engines are evolved space shuttle main engines, upgraded with new components to produce the additional power needed to help launch NASA’s SLS rocket. The first four Artemis …

Apr 24, 2025 · RS-25 Core Stage Engine Evolution The RS-25 powered the space shuttle for over three decades and completed 135 missions. It is one of the most tested large rocket engines in history, …

Jan 10, 2026 · NASA fired up RS-25 engine No. 20001 at the Fred Haise Test Stand at NASA’s Stennis Space Center at Bay St. Louis, Mississippi. The test lasted about "eight-and-a-half minutes (500 …

Apr 15, 2024 · The RS-25 rocket engine has been a driving force behind America’s space program for over 40 years. From its origins as the Space Shuttle Main Engine to its current role in the Space …

Jun 24, 2025 · NASA and L3Harris Technologies have successfully test-fired the first RS-25 rocket engine slated to help power the fifth launch of the Space Launch System or SLS rocket for the …

Sep 13, 2013 · Four RS-25 engines will power the core stage of the world’s most powerful rocket, NASA’s Space Launch System. Towering more than 200 feet tall with a diameter of 27.6 feet, the …